Ok so thus far ive managed to get booting with no black screen or editing of grub by using these bios settings
bios setting
power express disabled
dynamic mode enabled
igpu forced performance
_osc to pci0 enabled
enabled all ports for sb gpp
enabled sb memory reverse
then i went and made some config files
sudo nano /etc/modprobe.d/amdgpu.conf
paste this in
options amdgpu si_support=1
options amdgpu cik_support=1
sudo nano /etc/modprobe.d/radeon.conf
options radeon si_support=0
options radeon cik_support=0
sudo nano /etc/mkinitcpio.conf
mkinitcpio -P
sudo update-initramfs -u
sudo nano/etc/mkinitcpio.conf
MODULES=(amdgpu radeon)
sudo nano /etc/X11/xorg.conf.d/20-amdgpu.conf
Section "Device"
Identifier "AMD"
Driver "modesetting"
#Option "AccelMethod" "Glamor" #valid options are XAA, EXA and Glamor. Default value varies per-GPU.
#Option "AccelMethod" "XAA" #valid options are XAA, EXA and Glamor. Default value varies per-GPU.
#Option "AccelMethod" "EXA" #valid options are XAA, EXA and Glamor. Default value varies per-GPU.
Option "DRI3" "on" #enable DRI3 instead of the default DRI2-mode
EndSection
reupdated initamfs
rebooted and now the 8970m is detected in amdgpu mode and the 8650g is in radeon mode
running unigine heaven and only the igpu is running still any help?
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